Các câu hỏi tương tự
tinh: B= (1/2)-(1/2^2)+(1/2^3)-(1/2^4)+...+(1/2^99)-(1/2^100)
tinh 1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+...+1/(1+2+3+4+...+99)+1/50
tinh A/B, biet
A=1/2*32+1/3*33+1/4*34+...+1/n*(n+30)+...+1/1973*2003
B=1/2*1974+1/3*1975+1/4*1976+...+1/n*(n+1972)+...+1/31*2003.
tinh S=1+a+a2+a3+a4+....+a99+b
voi a=1/2 va b=1/299
a, Cho A= 1/99 + 2/98 + 3/47 + .......... + 98/2 + 99/1
B= 1/2 + 1/3 + 1/4 + ..........+ 1/99 + 1/100
Tính B/A
b, Cho A= 1/49 + 2/48 + 3/47 +.......+ 48/2 +49/1
B= 1 + 2/3 + 2/4 +......+ 2/49 + 2/50
Tính A/B
Tinh \(B=\left(\frac{1}{2^2}-1\right)\cdot\left(\frac{1}{3^2}-1\right)\cdot\left(\frac{1}{4^2}-1\right)\cdot....\cdot\left(\frac{1}{98^2}-1\right)\cdot\left(\frac{1}{99^2}-1\right)\)
Tính B = 1/2+(1/2)^2+ (1/2)^3+(1/2)^4+....+(1/2)^98+(1/2)^99+(1/2)^99 Ta được B=
tinh B=1/2+(1/2)2 + ...(1/2)99+(1/2)99
tinh S=1/2+(1/2)^2+....+(1/2)^99
tinh B=(-1/7)^0+(-1/7)^2+...+(-1/7)^2007